Period Variations in the Beta Cep Star β Cru

1994 ◽  
pp. 25-26 ◽  
Author(s):  
J. C. Valtier ◽  
E. Chapellier ◽  
J. M. Le Contel
Keyword(s):  
Period Variations

On nearly-commensurable periods in the restricted problem of three bodies, with calculations of the long-period variations in the interior 2:1 case

1966 ◽  
Vol 25 ◽  
pp. 197-222 ◽  
Author(s):  
P. J. Message
Keyword(s):  
Periodic Solution ◽  
Periodic Solutions ◽  
Large Amplitude ◽  
Restricted Problem ◽  
Small Amplitude ◽  
Minor Planets ◽  
Long Period ◽  
Numerical Integrations ◽  
Period Variations ◽  
The Mean

An analytical discussion of that case of motion in the restricted problem, in which the mean motions of the infinitesimal, and smaller-massed, bodies about the larger one are nearly in the ratio of two small integers displays the existence of a series of periodic solutions which, for commensurabilities of the typep+ 1:p, includes solutions of Poincaré'sdeuxième sortewhen the commensurability is very close, and of thepremière sortewhen it is less close. A linear treatment of the long-period variations of the elements, valid for motions in which the elements remain close to a particular periodic solution of this type, shows the continuity of near-commensurable motion with other motion, and some of the properties of long-period librations of small amplitude.To extend the investigation to other types of motion near commensurability, numerical integrations of the equations for the long-period variations of the elements were carried out for the 2:1 interior case (of which the planet 108 “Hecuba” is an example) to survey those motions in which the eccentricity takes values less than 0·1. An investigation of the effect of the large amplitude perturbations near commensurability on a distribution of minor planets, which is originally uniform over mean motion, shows a “draining off” effect from the vicinity of exact commensurability of a magnitude large enough to account for the observed gap in the distribution at the 2:1 commensurability.

On the Long-Period Variations in the F2Region of the Ionosphere

1938 ◽  
Vol 26 (11) ◽  
pp. 1340-1346 ◽  
Author(s):  
Keikitiro Tani ◽  
Y. Ito ◽  
H. Sinkawa
Keyword(s):  
Long Period ◽  
Period Variations

scholarly journals Survey of period variations of superhumps in SU UMa-type dwarf novae. IX. The ninth year (2016–2017)

2017 ◽  
Vol 69 (5) ◽  
Author(s):  
Taichi Kato ◽  
Keisuke Isogai ◽  
Franz-Josef Hambsch ◽  
Tonny Vanmunster ◽  
Hiroshi Itoh ◽  
...  
Keyword(s):  
Dwarf Novae ◽  
Period Variations

Long-period variations in the magnetic field of small-scale solar structures

2016 ◽  
Vol 56 (8) ◽  
pp. 1052-1059 ◽  
Author(s):  
P. V. Strekalova ◽  
Yu. A. Nagovitsyn ◽  
A. Riehokainen ◽  
V. V. Smirnova
Keyword(s):  
Magnetic Field ◽  
Small Scale ◽  
Long Period ◽  
Period Variations ◽  
The Magnetic Field

scholarly journals Torsional oscillations and observed rotational period variations in early-type stars

2016 ◽  
Vol 464 (1) ◽  
pp. 933-939 ◽  
Author(s):  
J. Krtička ◽  
Z. Mikulášek ◽  
G. W. Henry ◽  
P. Kurfürst ◽  
M. Karlický
Keyword(s):  
Rotational Period ◽  
Early Type ◽  
Torsional Oscillations ◽  
Period Variations ◽  
Early Type Stars

scholarly journals Short-period variations of the vertical electric current in the air.

1984 ◽  
Vol 36 (6) ◽  
pp. 229-238
Author(s):  
S. B. ANISIMOV ◽  
N. N. RUSAKOV ◽  
V. A. TROITSKAYA
Keyword(s):  
Electric Current ◽  
Short Period ◽  
Period Variations

scholarly journals UBV photometry and period variations of V 839 Ophiuchi

1997 ◽  
Vol 125 (3) ◽  
pp. 407-417 ◽  
Author(s):  
A. Akalin ◽  
E. Derman
Keyword(s):  
Period Variations ◽  
Ubv Photometry

Orbital period variations of two W UMa-type binaries: UY UMa and EF Boo

New Astronomy ◽  
2017 ◽  
Vol 55 ◽  
pp. 13-16 ◽  
Author(s):  
Yun-Xia Yu ◽  
Xu-Dong Zhang ◽  
Ke Hu ◽  
Fu-Yuan Xiang
Keyword(s):  
Orbital Period ◽  
Period Variations
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